如何配好TIM与DMA

imfly89

#include "pwm_output.h"

static void TIM1_GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    /* TIM1 clock enable */
    //PCLK1经过2倍频后作为TIM1的时钟源等于72MHz
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);


    /* GPIOA and GPIOB clock enable */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11  ;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;                    // 复用推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOA, &GPIO_InitStructure);


    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15 ;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;                    // 复用推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOB, &GPIO_InitStructure);
}

#define TIM1_CCR1_Address    0x40012C34
#define TIM1_CCR3_Address    0x40012C3C
#define TIM1_CCR4_Address    0x40012C40

#define DMA_Channel_TIM1_CCR1  DMA1_Channel2
#define DMA_Channel_TIM1_CCR2  DMA1_Channel3
#define DMA_Channel_TIM1_CCR3  DMA1_Channel6
#define DMA_Channel_TIM1_CCR4  DMA1_Channel4

uint16_t    hBuff[4] = {50,400,150,200} ;

static void TIM1_Mode_Config(void)
{
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;
    DMA_InitTypeDef     DMA_InitStructure ;
        /* PWM信号电平跳变值 */
        u16 CCR1_Val = 0;        
        u16 CCR2_Val = 0;
        u16 CCR3_Val = 0;
        u16 CCR4_Val = 500;

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);  
    /* DMA1 channel1 configuration ----------------------------------------------*/
  DMA_DeInit(DMA_Channel_TIM1_CCR1);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM1_CCR1_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)hBuff;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 4;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

  DMA_Init(DMA_Channel_TIM1_CCR1, &DMA_InitStructure);

  /* Enable DMA1 channel1 */
  DMA_Cmd(DMA_Channel_TIM1_CCR1, ENABLE);



/* -----------------------------------------------------------------------
    TIM1 Configuration: generate 4 PWM signals with 4 different duty cycles:
    TIM1CLK = 72 MHz, Prescaler = 0x0, TIM1 counter clock = 72 MHz
    TIM1 ARR Register = 999 => TIM1 Frequency = TIM1 counter clock/(ARR + 1)
    TIM1 Frequency = 72 KHz.
    TIM1 Channel1 duty cycle = (TIM1_CCR1/ TIM1_ARR)* 100 = 50%
    TIM1 Channel2 duty cycle = (TIM1_CCR2/ TIM1_ARR)* 100 = 37.5%
    TIM1 Channel3 duty cycle = (TIM1_CCR3/ TIM1_ARR)* 100 = 25%
    TIM1 Channel4 duty cycle = (TIM1_CCR4/ TIM1_ARR)* 100 = 12.5%
  ----------------------------------------------------------------------- */

  /* Time base configuration */                 
  TIM_TimeBaseStructure.TIM_Period = 999;       //当定时器从0计数到9999，即为1000次，为一个定时周期
  TIM_TimeBaseStructure.TIM_Prescaler = 71;            //设置预分频：不预分频，即为72MHz
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;        //设置时钟分频系数：不分频
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned3;  //上顶点与下低点  触发比较中断标志位
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0 ;

  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  /* PWM1 Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;            //配置为PWM模式1
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable ;
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;           //设置跳变值，当计数器计数到这个值时，电平发生跳变
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_High ;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset ;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

  TIM_OC1Init(TIM1, &TIM_OCInitStructure);         //使能通道1

  TIM_OCInitStructure.TIM_Pulse = CCR2_Val;          //设置通道2的电平跳变值，输出另外一个占空比的PWM
  TIM_OC2Init(TIM1, &TIM_OCInitStructure);          //使能通道2

  TIM_OCInitStructure.TIM_Pulse = CCR3_Val;        //设置通道3的电平跳变值，输出另外一个占空比的PWM
  TIM_OC3Init(TIM1, &TIM_OCInitStructure);         //使能通道3

  TIM_OCInitStructure.TIM_Pulse = CCR4_Val;        //设置通道4的电平跳变值，输出另外一个占空比的PWM
  TIM_OC4Init(TIM1, &TIM_OCInitStructure);        //使能通道4

  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Disable);
  TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Disable);
  TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Disable);
  TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Disable);

  TIM_DMAConfig(TIM1, TIM_DMABase_CCR1, TIM_DMABurstLength_4Bytes);

  TIM_DMACmd(TIM1, TIM_DMA_CC1, ENABLE);

  TIM_GenerateEvent(TIM1,TIM_EventSource_CC1);
  TIM_UpdateRequestConfig(TIM1,TIM_UpdateSource_Global);



  /* TIM1 enable counter */
  TIM_Cmd(TIM1, ENABLE);                 
  TIM_CtrlPWMOutputs(TIM1,ENABLE);

}

void TIM1_PWM_Init(void)
{
        TIM1_GPIO_Config();
        TIM1_Mode_Config();       
}

/********************************/
以上代码，我的本意是想在TIM1->CCR1与计数值发生匹配的时候触发DMA更新TIM1->CCR1的值，但是实际情况却是在中心对齐的计数器顶端与底端才会触发DMA的传送，希望有人给我纠错。谢谢

imfly89

调整了下数组的数字顺序，OK了

imfly89

沉了。。。。。帖子要浮起来